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Servlet简单登录界面自学笔记三

2016-11-15 11:09 351 查看

一.登录界面模型

二.登录代码

package com.gaofei.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Login extends HttpServlet{

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
//解决中文乱码问题
resp.setContentType("text/html;charset=gbk");
//得到PrintWriter对象
PrintWriter pw=resp.getWriter();
pw.println("<html>");
pw.println("<body>");
//action后面写需要把数据提交到那个servlet的url
pw.println("<form action=logincl  method=GET><br>");
pw.println("用户名<input type=text  name=username><br>");
pw.println("密码<input type=password name=passwrod><br>");
pw.println("<input type=submit  value=登录>");
pw.println("<input type=reset value=刷新 >");
pw.println("</form>");
pw.println("</body>");
pw.println("</html>");
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
this.doGet(req, resp);

}

}

二.逻辑部分代码

package com.gaofei.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginCl extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        //从浏览器接收参数
        String uname = req.getParameter("username");
        String upasswrod = req.getParameter("passwrod");
        
        try {
            if(uname.equals("abc")&&upasswrod.equals("123")){
                //跳转  填要跳转的servlet的那个url
                resp.sendRedirect("welcome");
            }else{
                //同上
                resp.sendRedirect("login");
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doGet(req, resp);
    }

}

三.wel界面

package com.gaofei.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Wel extends HttpServlet{

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
//从浏览器接收参数
PrintWriter pw = resp.getWriter();
//向浏览器输出字符
pw.println("welcome to my home!");
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
this.doGet(req, resp);
}

}

四.wed.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>com.gaofei.servlet.Login</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>

<servlet>
<servlet-name>LoginCL</servlet-name>
<servlet-class>com.gaofei.servlet.LoginCl</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>LoginCL</servlet-name>
<url-pattern>/logincl</url-pattern>
</servlet-mapping>

<servlet>
<servlet-name>Wel</servlet-name>
<servlet-class>com.gaofei.servlet.Wel</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>Wel</servlet-name>
<url-pattern>/welcome</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

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